body { 
    font-family: Arial, sans-serif; margin: 20px; 
    background-color: silver;
}

#log { 
    white-space: pre-wrap; border: 1px solid #ccc; padding: 10px; height: 250px; overflow-y: auto; background: #f9f9f9; 
}

input, button { 
    margin: 5px 0; padding: 5px; 
}

button {
     cursor: pointer; 
    }